mineral fiber ceiling board specification
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The spacing between main tees (the primary runners that run the length of the ceiling) is commonly 4 feet apart when installed in a rectangular grid configuration. The cross tees, which connect the main tees and create the grid layout, are generally found in lengths of 2 feet and 4 feet, allowing for flexibility in design and installation.
t bar ceiling grid dimensions

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Replacing the old tiles but keeping the grid - save time, money, and labor while giving your space a makeover with fresh new tiles.
A drywall ceiling hatch is a concealed access opening built into a ceiling to allow entry into enclosed spaces above. Typically, these hatches are designed to fit flush with the drywall, featuring a smooth, paintable surface that can be finished to match the surrounding ceiling. They come in various sizes and configurations, catering to specific needs, whether it's accessing plumbing, electrical wiring, or HVAC systems.